18536628 has 72 divisors (see below), whose sum is σ = 49926240. Its totient is φ = 5307840.

The previous prime is 18536627. The next prime is 18536641. The reversal of 18536628 is 82663581.

It is a happy number.

It is a super-2 number, since 2×18536628² = 687213155220768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47458 + ... + 47846.

It is an arithmetic number, because the mean of its divisors is an integer number (693420).

Almost surely, 2^18536628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18536628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24963120).

18536628 is an abundant number, since it is smaller than the sum of its proper divisors (31389612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18536628 is a wasteful number, since it uses less digits than its factorization.

18536628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 424 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 18536628 is about 4305.4184465624. The cubic root of 18536628 is about 264.6530549278.

The spelling of 18536628 in words is "eighteen million, five hundred thirty-six thousand, six hundred twenty-eight".